Effect of cave overlying soil and bedrock on drip water elements in rocky desertifiton area in Bijie, Guizhou
The elements source and rocky desertification effect of drip water were explored in caves under different rocky desertification, which are Chaoying Cave ( potential) and Hanjiachong Cave ( intense) in Bijie, Guizhou. An in situ monitoring was carried out on their drip elements and drip rates throughout a year to analyze the overlying soil and bedrock elements respectively. Results indicated that the contents of Ca, Mg and Sr in the overlying soil of Chaoying Cave were higher than those of Hanjiachong Cave. The mean concentrations of Ca2+, Mg2+, Ba2+and Sr2+in the drip water were 60. 81, 3. 24, 0. 012 and 0. 085 mg·L-1 in Chaoying Cave and 58. 39, 2. 47, 0. 01 and 0.074 mg·L-1 in Hanjiachong Cave. Drip rates responded more sensitively to rainfall along with more severe surface rocky desertification. The overlying bedrock contributed more to drip water elements when the seasonal variation was large. Ion concentration of drip water in Chaoying Cave rose in the rainy season and fell in the dry season, while in Hanjiachong Cave the pattern was opposite. This was attributed to the discrepancy of surface rocky desertification effect.
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万方数据
